Steam-boiler



(No Model.) 2 Sheets-Sheet 1.

. T. POORE.

STEAM BOILER. I No. 336,430. Patented Feb. 16, 18,86.

UNITED STATES PATENT OFFICE.

TOWNSEND POORE, OF SCRANTON, PENNSYLVANIA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 336,430, dated February16, 1886.

Application filed April 20, 1885. Serial No. 162627. (No model.)

To all whom it may concern:

Be it known that I, TOWNSEND Poona, a citizen of the Jnited States,residing at Scranton, in the county of Lackawanna and State ofPennsylvania, have invented a new and Improved Combined LocomotiveFurnace or Fire-Box and Boiler and Grate Therefor, of which thefollowing is a specification.

My invention consists, first, in an improved construction of alocomotive boiler and furnace with increased heating-surface by extendin g the furnace portion in a forward direction, so as to include in itscombustion-chamber or fire-room a part of the cylinder which containsthe usual tubes or fines, and by so reducing the diameter of saidflue-cylinder that the fines occupy the inner space of the same up toits top, thereby transferring the room or space ordinarily allowed forsteam from the cylinder to the steam room or space of the furnace, andby making a water or steam connection around the cylinder between it andthe furnace or fire-box at the forward end of the same, and by making asteam or water connection between the rear portion of the cylinder andwater and steam space above the crownsheet of the furnace or fire-box;and, second, it consists in certain constructions and combinations ofparts, as will be hereinafter described, and specifically claimed.

The objects of my invention are, to increase the direct fire-surface, todecrease the bulk of the cylinder, and consequently the top-heaviness ofthe boiler, while a free escape for steam is secured, and to produce aneffective locomotive-boiler, although heated with an inferior quality offuel, and an improved combined boiler furnace and grate adapted forburning culm.

In the accompanying drawings, illustrating my invention, Figure 1 is acentral vertical longitudinal section of the combined locomotivefire-box and steam-boiler and endlesschain grate. Fig. 2 is a front viewof the same, portions of the front being broken away to show thearrangement of the fine-tubes of the cylindrical portion of the boiler.Figs. 3, 5, and 6 are views of modified constructions of my invention.

A in the drawings represents the combined firebox and boiler, comprisinga locomotive furnace or fire-box portion, a, with water spaces b and bbetween its walls, and a steam dome, a and a cylindrical tubular boilerportion, a a a placed below the water-line of the combined fire-box andboiler, the same having a water-space, b, finetubes a and smokechamber aleading to Smokestack, as shown. The said fire-box, with waterspacesbetween its walls, is made with an increased length say it is lengthenedto an extent equal to the distance included between the in Fig. 1--'which length maybe equal, say, to the portion a of the boiler which isinclosed by the walls of the firebox, as shown.

The cylindrical and tubular portion of the boiler may be about theordinary length used on locomotives of a given size, and it has its partor constructed within the combustionchamber of the fire-box, so as to besurrounded by the fire of the furnace, and this portion is connected toand suspended from the top portion of the fire-box a by means of a shortstout pipe, 13, its front open end being connected with the water-spaceb" and steamdome a of the fire-box by means of a circular cylindricalportion of the combined furnace water-way, b. The other portion, a, ofthe cylindrical portion of the combined furnace or firebox and boiler isconstructed outside the fire-box, being fastened thereto, while itsforward end is connected to the smoke-box a, or stack of the locomotive.The fine tubes a are extended from rear to front flue-sheets, one sheetbeing at the rear end of the part a of the cylindrical portion of thecombined firebox and boiler, while the other is near the smoke-box, asshown.

From the drawings it will be seen that the spaces for containing waterto be generated into-steam are brought into the most intimate andeffective relation to the fire for the production of steam; also, thatthe communica' tion between one water-space and another is establishedin a very direct manner, while a large and free escape for the steamproduced is secured, and at the same time a very strong structureproduced.

My construction of combined steamgenerating fire-box and boiler gives acombustion chamber of extra length, while the cylindrical tubularportion of the structure may be of the length usually adopted for agiven-sized locomotive; and by this means an additional directfire-surface from the walls of the firebox, and also from the part a. ofthe cylin drical and tubular portion of the structure, is secured, thusvery greatly increasing the steam-generating capacity of the combinedlocomotive fire-box and boiler. Furthermore, by this construction thefire-box, on account IO of its great length and the large amount offire-surface, is adapted for the employment of an endless travelingchain grate, and the use of fine fuel, such as culm or siftings of coal.The most practical way of applying an end- 1 less-chain grate is toconstruct the fire-bed of a series of chains, 0, composed of linkedgrate-plates c, as shown; and when several chains formed of such platesare adopted, the chains may be supported on girders in the same manneras is shown and described in my pending application, No. 162,319, filedApril 15,1885, and moved together or separately by means of spiders D,provided with gear-wheels d, into which are meshed pinions d on a square2 or other suitable shaft, d The pinions d are loosely fitted on theshaft d, and when meshed with the wheels (1, operate the spidersconnected therewith, and thereby cause the chains to move slowly, andwhen it is desired 0 not to move a certain one of the chains when theothers are moved the pinion belonging to the spider of the said certainchain is slipped upon the shaft out of range of the wheel (I, asillustrated in Fig. 2. The shaft (1 5 is provided with a worm-wheel, E,which is operated by a worm, e, with a crank-handle, e, suitably hungupon the furnace.

For a more particular illustration and description of the grate 0, whenmade of several endless chains, reference is here made to my pendingapplication for a patent, No. 162,319, filed April 15, 1885.

If a single endless-chain grate is adopted, it will be suitablysupported by side and central 4 5 girders sustained by transversegirders set into the walls, and the slack of the chain may be kept up byrollers, as p.

The fire-box has an ash-box, as F, below the portion a of thecylindrical tubular boiler portion of the combined fire-box and boiler,

and is provided with a door, a*, with a peephole, a, which is covered bya slide, a The peep-hole permits observation, and when the progress ofthe fire is too slow the door can be opened for regulating thecombustion. A suitable hopper, G, with swinging lid 9, is applied belowthe door a and above that portion of the grate which is outside thefire-box, for the purpose of charging the grate with fuel. In the sidesof the fire-box doors I, for admitting air and implements for cleaningoff ashes and dbris from the grate, may be provided, and between theupper and lower portions of the endless-chain grate an ash screen orplatform, J, inclinedin opposite directions, may be used, as shown anddescribed in my aforesaid pending application, No. 162,319,

filed April 15, 1885. There may also be hinged plates at 'n. 0, forclosing the openings or passages of the fire-box through which the gratetravels.

In the views Figs. 3 and 4: my invention is shown applied to astraightor wagon-top combined fire-box and boiler, and in Figs. 5 and 6 theboiler part a is shown with a flat bottom. The flat bottom. will givemore room between part 01, and the grate than when part a is madecylindrical.

Vhen the boiler is brought into use, the cylinder is filled to the topwith water, and in the fire-box the crown-sheet is covered to areasonable depth with water, above which the steam is collected andconducted away from the dome u By this mode the steam is confined to acomparatively compact space without decreasing the ordinary steamcapacity of the locomotive. There is comparatively less cooling-surfacethan in the ordinary locomotive, and the place where the steam iscollected is in the hottest and most effective steamproducing portion ofthe boiler and therefore, the best adapted for this purpose of any otherportion of the whole structure.

In all the figures of the drawings my combined fire-box and boiler isrepresented sup- 95 ported upon wheels, as in locomotives;but it may beused without wheels for stationary engines, or for steamboat-engineswithout essentially changing the described construction and withoutdeparting from the principle of my invention.

I am aware of the state of the art prior to my inventions, as indicatedby Letters Patent Nos. 192,725 and 283,672; but in the former of thesethe flue-tubes do not extend any distance into the fire-box orcombustionchamber proper of the furnace, and the fluesheet is at thefront of the fire-chamber, and therefore the length of the combinedfire-box and boiler is much greater than mine, with no greater amount ofdirect fire-surface than is secured in my boiler, and, besides this, thelarge amount of the rear portion of the tubular boiler is not thrownbodily into the firechamber, as in my construction. In the latter patentthe tubular boiler is not applied longitudinally withv the firebox, andthe general construction and combination is such that an upright insteadof a locomotive combined fire-box and boiler is produced, wherein thetubular portion of the structure is transverse to or at right angles tothe sides of the fire-box, and there is no practical construction of atubular cylindrical locomotive-boiler outside the fire-box, with a largeportion of the same directly thrown in contact with the fire in thefire-chamber proper, as in my plan.

I also am aware of English Patent N o. 591 for 1883, wherein theboiler-tubes are extended into the fire-box, and make no claim toanything claimed in said patent.

What I claim as my invention is- 1. The combination, with thelocomotiveboiler furnace having its front portion ex ICC III)

tended, as ata; m, of a cylinder applied partly w m, flue-cylinder a a,steam and water way IO inside and partly outside the furnace and atd,and steam and water connection B betached to the front end of the same,below the tween the cylinder portion a, and the top porwater-line, andcontaining the usual boilertion of the furnace, substantially as and forthe flues, and of suitable water and steam connecpurpose described.

tions between the furnace and cylinder, sub- TOW'NSEND POORE. stantiallyas and for the purpose described. \Vitnesses:

2. The combined boiler-furnace comprising J. F. SNYDER, a furnace havingthe extended front portion,as HENRY J IFKINS.

